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Each grade except Grades 21L, 22L, and 91 is available in two classes of tensile strength described as Class 1 and Class 2.

The most regularly specified grades and hence those that are most readily available from stock are Grades 12, 11, 22, 5, and 9 and in most case stock plates will be produced to the tensile requirements of Class 2.

As with all ASME and ASTM pressure vessel steels, Chrome Moly to SA387 and A387 is produced in conformity to SA20 / A20 which outlines the testing and retesting methods and procedures, permissable variations in dimensions and weight, quality and repair of defects, marking, loading, and ordering information.

In addition to the basic requirements of SA20 / A20 certain supplementary requirements are available when additional control, testing, or examination is required to meet end use requirements. These might include product analysis (S2), charpy V-notch impact test (S5), or ultrasonic testing (S12): a variety of supplementary requirements are available.

The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum plates used in the application of welded boilers and pressure vessels subjected to elevated temperatures.

ASME SA387 / ASTM A387 PROPERTIES

GRADE

NOMINAL CR CONTENT (%)

NOMINAL MO CONTENT (%)

2

0.50

0.50

12

1.00

0.50

11

1.25

0.50

22, 22L

2.25

1.00

21, 21L

3.00

1.00

5

5.00

0.50

9, 91

9.00

1.00

ASME SA387 / ASTM A387 Chemical Requirements

GR. 2

GR. 12

GR. 11

GR. 22

GR. 22L

GR. 21

GR. 21L

GR. 5

GR. 9

GR. 91*

C

0.05-0.21

0.05-0.17

0.05-0.17

0.05-0.15

0.10

0.05-0.15

0.10

0.15

0.15

0.08-0.12

Mn

0.55-0.80

0.40-0.65

0.40-0.65

0.30-0.60

0.30-0.60

0.30-0.60

0.30-0.60

0.30-0.60

0.30-0.60

0.30-0.60

P

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.020

S

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.010

Si

0.15-0.40

0.15-0.40

0.50-0.80

0.50

0.50

0.50

0.50

0.50

1.00

0.20-0.50

Cr

0.50-0.80

0.80-1.15

1.00-1.50

2.00-2.50

2.00-2.50

2.75-3.25

2.75-3.25

4.00-6.00

8.00-10.00

8.00-9.50

Mo

0.45-0.60

0.45-0.60

0.45-0.65

0.90-1.10

0.90-1.10

0.90-1.10

0.90-1.10

0.45-0.65

0.90-1.10

0.85-1.05

V

-

-

-

-

-

-

-

-

0.04

0.18-0.25

ASME SA387 / ASTM A387 Tensile Requirements

ASME SA387 / ASTM A387 Class 1 Plates

GRADE

TENSILE (MPA)

YIELD (MPA)

ELONG. (50MM)

REDUC'N OF AREA*

2, 12

380 - 550

230 min

22% min

-

11

415 - 585

240 min

22% min

-

22, 21, 5, 9

415 - 585

205 min

18% min

40% min

21L, 22L

415 - 585

205 min

18% min

40% min

As a quality chrome molybdenum steel, A387 Grade 11 Class 2 is used in a variety of industries and is highly effective, particularly in the oil, gas and chemical industry, where liquids and gases are often stored at high temperature (see pressure vessels). The higher levels of chromium also provide excellent corrosion and oxidation resistance.